Frequently Asked Questions

Q.What is Particulate Matter?

A. Particulate matter pollution consists of very small liquid and solid particles floating in the air. Of greatest concern to the public health are the particles small enough to be inhaled into the deepest parts of the lung. These particles are less than 10 microns in diameter--about 1/7th the thickness of a human hair--and are known as PM10. This includes fine particulate matter known as PM2.5. PM10 is a major component of air pollution that threatens both our health and our environment.

Construction activities disturbing the soil within Maricopa County are regulated by the Maricopa County Air Quality Department. Although regulations require everyone to minimize emissions from dust generating operations, projects that have a total disturbed surface area of 1/10 acre (4,356 sq ft) or more are required to obtain a valid Dust Control Permit. The project is required to have a valid permit before the soil is disturbed.

Q. When do I need to obtain a dust control (dust control) permit?

A. Whenever your activity will disturb more than 1/10th acre (4,356sq.ft.). This area of disturbance includes stockpiles, storage and equipment yards and the area being disturbed.

Q. What is the cost of a dust control permit?

A. Less than one acre is $350.00. One acre or more has an adminstrative flat fee of $350.00 and a multiplier of $77.00 per acre. (ie. A 6 acre site would be $350.00 + ($77.00 X 6 Acres) = $812.00)

Q. Can I e-mail or fax my application?

A. Applications must be submitted with an original signature and payment.  Applications can be mailed to or dropped off at the One Stop Shop which is located at 501 N 44th Street, Suite 200, Phoenix, Arizona 85008.  Fax and e-mail applications are not accepted.

Q. What else would require a dust control permit?

A. The demolition of a building, operation of an inert landfill, import/export operation, borrow pit, or mining operations that do not require a stationary source permit.

Q. How long does the dust control permit remain active?

A. One year from the date of issue.

Q. How do I renew my permit?

A. This is a reapplication process so you will need to submit a dust control application. The disturbed acreage may be reduced by any area that has undergone final stabilization (e.g. hardscape or landscape). Remember to reapply at least two weeks before your permit expires.

Q. Can a subcontractor obtain a dust control permit?

A. No, only the Owner, Developer or the prime general contractor is authorized. The county wants the permit holder to be able to be on site from the beginning to the end of the job and have authority over all persons working the job site..

Q. Do I have to get a dust control permit for discing or using a gander box to clear weeds?

A. Yes, weed abatement is a permitted activity.

Q. If mud tracks out onto a paved public roadway how long do I have to clean it up?

A. If the track-out is less than fifty feet it must be cleaned by the end of the day. If the track-out is more than fifty feet it must be cleaned immediately.

Q. What is a project information sign and why do we have to have one?

A. Project information signs are required for projects over five planned acres of disturbed surface. The project information sign must have a white background and black four-inch letters. The sign lists the Project Name, Permit Name, Permit Number, Name and Phone Numbers of responsible on site personnel and the phone number to the Air Quality Department to report a violation.

The project sign allows a neighbor or citizen observing poor dust control practices an opportunity to directly address the problem with the contractor in charge of the project. If the citizen does not obtain satisfaction from the contractor they should call the listed complaint line and formally file a citizen's complaint. An air quality inspector will be assigned to the complaint and make every effort to resolve all issues as quickly as possible.

Q. How long does the dust control permit process take?

A. For completed applications the process can take up to 14 days. If an incomplete application is submitted approval time will depend on responsiveness of the applicant.

Q. Should I have a dust control permit before conducting activity on an issued grading and drainage permit or building permit?

A. Yes.

Q. What happens if my employees or subcontractors do not follow the dust rules?

A. Maricopa County Air Pollution Regulations Rule 310 contains specific requirements that must be followed to prevent fugitive dust emissions from earthmoving activities. A permit holder is responsible for persons on site who violate the Maricopa County Air Pollution Control Regulation and may be subject to Notice of Violation issued by a County Inspector.

Q. Do Utility companies working on my site have to follow the same air quality rules?

A. Yes, the same rules apply. If a utility company or their subcontractor causes fugitive dust emissions ask them to modify their activity or call in a citizen complaint at 602-372-2703. The utility company or its contractor will have a dust control or Block permit and dust control plan with the same type of requirements.

Q. Where can I get help filling out the dust control application?

A. Maricopa County Air Quality Department offers classes on how to properly fill out dust control applications as well as training classes on dust compliance for Rule 310. For more information, please contact the Dust Compliance Division at 602-506-6010.

Q. Where can I drop off my dust control application?

A. One Stop Shop was created as a way to streamline Maricopa County customer service by offering all customer service needs in one location. Drop off all of your dust permit applications at One Stop Shop at the following location:

Maricopa County Planning & Development
501 North 44th Street, Suite 200
Phoenix, Arizona 85008
(on 44th Street, north of Van Buren)
(602) 372-1071

Q. How do you make sure all applications are received from legal, Arizona companies?

A. The Maricopa County Air Quality Department requires all applicants be registered with the Arizona Corporation Commision before their application is approved. As per A.R.S. §10-1501, a corporation SHALL NOT transact business in this state without obtaining authority from the Commission. The requirements our department follows can be found on the Arizona Corporation Commission website here. Click on "Arizona Laws" then scroll over "Corporations Statutes" and visit chapters 15 and 38 to view these requirements.